Device for promoting the impetus of foot-power machines.



PATEN-TED APR. 30, 1907.

A. J. PIERCE. 'DBVIGE IOR PROMOTING THE'IMPETUS OF FOOT POWER MACHINES.

APPLICATION FILED JAN. 22, 1906.

WITNESSES.-

UNITED STATES AMANDA J. PIERCE, OF

Specification of Letters Patent.

PATENT @FFICE.

SALT LAKE CITY, UTAII.

ETUS OF FOOT-POWER MACHINES.

Patented April 30, 1907.

Application filed January 22,1906. Serial No- 297,225.

To all lull/011 b it may concern.-

Be it known that I, AMANDA J. Pinuon, a citizen of the United States of America, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented certain new and useful Improvements in Devices for Promoting the Impetus of Foot- Power Machines, of which the following is a specification.

My invention relates to a device purported to impart impetus to the treadle and the therewith connected movable parts of a sewing machine and has for its object the provision of a simple contrivance which, remain ing detached during its operation, may be employed in connection with any footpower machine, irrespective of its size form or construction, for the purpose of assisting in maintaining velocity and overcoming resistance, and to render the motion of the movable parts of the machine equable and regular.

The fatigue, discomfort and musculous torpor experienced by women whose occupa tion necessitates the daily use of a foot-power sewing. machine, may readily be attributed to two causes, viz, the energy required to impart and maintain the motion of the mechan- I ism of the machine, and the concussions, jars and short tremulous motion which as a natural consequence of the movement and backlash of the connected parts, are imparted to the treadle or foot-lever.

I attain my object by the mechanism illustrated in the accompanying drawings in the various views of which like parts are similarly designated and in which,

Figure l represents a fragmentary view of the lower portion of a sewing machine with my appliance in operative position, Fig. 2- a plan view of my device and Fig. 3 a side elevation thereof.

Referring to the drawings, 5 represents a flat oblong upwardly extending spirally coiled, preferboard or base provided with two The device is applied to a sewing machine by slightly compressing the springs which after the board 5 has been placed on the floor 1 below the treadle or foot-lever 9, as shown in I Fig. 1, engages the lower surface of the latter. As the force applied to the rear portion 9 of the treadle, in practice, engaged by the ball of-the operators foot, greatly exceeds I that applied to the foremost arm 9 and the I foot-lever normally assumes a slanting position, the, in practice rearmost spring 7 has been made longer and in consequence more powerful than the opposite spring 6.

During the oscillating movement of treadle 9, the alternately contracting and expanding springs act as cushions to diminish concussion and, when released from the state of tension, impart the necessary impetus to the treadle to maintain its velocity and overcome the resistance of the pitman, cranl-:-arm, and other connected parts. The movement of the machine is thus rendered regular and equable and the energy required for its operation reduced to a minimum.

Having thus described my I I claim is As an article of use in connection like treadles,

invention what manufacture, a device for with sewing machine and comprising a single Ilat base piece designed to rest upon the floor beneath the treadle, and two springs of unequal length carried by the opposite ends of said base piece and designed to bear against the under side of the treadle on opposite sides of its pivot, substantially as described.

In testimony whereof I have all'lxed my signature in presence of two witnesses.

AMANDA J. PIERCE.

I WVitnesses: J. PARLEY WHITE, I A. H. STULE. 

